DESC:FORM 2

THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003

COMPLETE SPECIFICATION
(See Section 10 and Rule 13)

Title of invention:
A METHOD FOR PREVENTING WHEEL RIM FAILURE IN HEAVY DUTY TRUCKS

Applicant:
BEML Limited
A company Incorporated in India under the Companies Act, 1956
Having address:
BEML Soudha, 23/1, 4th Main,
Sampangirama Nagar, Bengaluru - 560 027,
Karnataka, India

The following specification particularly describes the invention and the manner in which it is to be performed.

CROSS-REFERENCE TO RELATED APPLICATION AND PRIORITY
[001] The present application claims priority from Indian Patent application no. (201941053720) filed on 24th December, 2019.
TECHNICAL FIELD
[002] The present subject matter described herein, in general, relates to preventing wheel rim failure in heavy duty trucks by a method of properly gripping the wheel rim and tyre by improved flange thickness, application vegetable based lubricant before assembly and inflating tyre above required tyre pressure for some time and then bringing back to required pressure.
BACKGROUND
[003] A tyre is a ring-shaped component that surrounds a wheel's rim to transfer a vehicle's load from the axle through the wheel to the ground and to provide traction on the surface over which the wheel travels. Tyres for automobiles and bicycles, are pneumatically inflated structures, which provide a flexible cushion that absorbs shock as the tire rolls over rough features on the surface. General construction of an automobile wheel consists of a wheel rim, tyre with tube or tubeless and valve stem. Tyre inflation can be achieved by a tube inside tyre or a tubeless tyre. Tubeless tyres are pneumatic tires that do not require a separate inner tube. Unlike pneumatic tyres which use a separate inner tube, tubeless tyres have continuous ribs molded integrally into the bead of the tire so that they are forced by the pressure of the air inside the tire to seal with the flanges of the metal rim of the wheel. In a tubeless tyre, the tyre and the rim of the wheel form an airtight seal, with the valve being directly mounted on the rim. If a tubeless tyre gets a small puncture, air escapes only through the hole, leading to a gentle deflation. Conversely, a tubed tyre, with an inner tube, could potentially burst like a balloon, leading to deflation of the tyre which could result in sudden loss of control of the vehicle. Due to these advantages of tubeless tyres nowadays they are widely used in automobile wheels.
[004] Generally, wheel side rim failure in a tyre of a heavy duty vehicle occurs due to improper flange thickness, lack of application of lubrication grease during rim assembly, and incorrect inflation of the assembled tyre. During tyre assembly, the gap between detachable flange and side rim is uneven and leads to uneven load distribution during operation. Further, lubricant is not applied on the outer surface of the flange and tyre bead seating during tyre assembly leading to improper seating of rim and tyre components. Furthermore, incorrect amount of inflation of assembled tyre leads to incorrect seating of the tyre bead on wheel rim assembly.

OBJECT OF THE INVENTION
[005] Main object of the present invention to prevent wheel rim failure.
[006] Another object of the present invention is to ensure proper gripping of the tyre to wheel rim.
[007] Yet another object of the present invention is to improve inner rim flange and main rim thickness.
[008] Another object of the present invention is to lubricate rim and beads to ensure proper seating of tyre seating on wheel rims during tyre assembly.
[009] Another object of the present invention is to inflate tyre to 20 % more than the desired pressure and reduce the pressure to required pressure for proper tyre assembly.

SUMMARY
[0010] Before the present system and method are described, it is to be understood that this application is not limited to the particular machine or an apparatus, and methodologies described, as there can be multiple possible embodiments that are not expressly illustrated in the present disclosures. It is also to be understood that the terminology used in the description is for the purpose of describing the particular versions or embodiments only, and is not intended to limit the scope of the present application. This summary is provided to introduce aspects related to a method for preventing wheel rim failure in heavy duty trucks, and the aspects are further elaborated below in the detailed description. This summary is not intended to identify essential features of the proposed subject matter nor is it intended for use in determining or limiting the scope of the proposed subject matter.
[0011] A method for preventing wheel rim failure comprises proper tyre seating on wheel rims during tyre assembly. Further, the outer surface of the flange and tyre beads is properly lubricated, thereby resulting in proper seating of rim and tyre components. Furthermore, to ensure proper bead seating, the tyres are assembled with appropriate lubrication and then inflated to a pressure more than the desired pressure. Moreover, the inflated pressure is then reduced to the desired pressure to permit proper gripping of tyres to wheel rim and bead seating.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The foregoing summary, as well as the following detailed description of embodiments, is better understood when read in conjunction with the appended drawing. For the purpose of illustrating the disclosure, there is shown in the present document example constructions of the disclosure, however, the disclosure is not limited to the specific methods and apparatus disclosed in the document and the drawing:
[0013] The detailed description is described with reference to the accompanying figure. In the figure, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawing to refer like features and components.
[0014] Figure 1 illustrates a main rim and an inner rim flange in accordance with one embodiment of the present subject matter.
[0015] Figure 2A, 2Band 2C illustrates a valve base and its fitment on the tyre rim, in accordance with one embodiment of the present subject matter.
[0016] Figure 3A and 3B illustrates application of lubricant on main rim, in accordance with one embodiment of the present subject matter.
[0017] Figure 4A & 4Billustrates an installation procedure of a tyre on wheel rim, o ring & lock ring in accordance with one embodiment of the present subject matter.
[0018] Figure 5illustrates an inflation and deflation of tyre, in accordance with one embodiment of the present subject matter.
[0019] Figure 6 illustrates flowchart for a method to ensure proper seating of tyre and rim assembly.
[0020] The figure depicts various embodiments of the present disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following discussion that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION OF THE INVENTION
[0021] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "comprising", “having”, and "including," and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. Although any systems and methods similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the exemplary, systems and methods are now described. The disclosed embodiments are merely exemplary of the disclosure, which may be embodied in various forms.
[0022] Various modifications to the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. However, one of ordinary skill in the art will readily recognize that the present disclosure is not intended to be limited to the embodiments illustrated, but is to be accorded the widest scope consistent with the principles and features described herein.
[0023] Wheel rim failure of heavy duty truck can lead to different losses such as truck components, goods in truck or safety of driver. Major causes of rim failure are improper rim flange thickness, no lubrication or improper tyre inflation procedure during wheel and tyre assembly.
[0024] To avoid rim failure of heavy duty truck rim flange thickness is improved, also to ensure proper tyre seating on wheel rims during tyre assembly, the outer surface of the flange and tyre beads seating are lubricated.
[0025] And to ensure proper bead seating, the tubeless tyre is inflated 20% more than the desired pressure and then reduced to required pressure. This leads to proper tyre bead and rim assembly.
[0026] Referring now to figure 1, in one aspect of present invention, an improved inner rim flange (20) is inserted in main rim (10). The thickness of improved inner rim flange (20) is 25mm for proper assembling of tubeless tyre (60) to wheel rim.
[0027] Referring now to figure 2A, 2B and 2C illustrates a valve base and its fitment on the tyre rim, in accordance with one embodiment of the present subject matter. Tubeless tyre (60) comprises of a valve stem (40) which consists of an upper nut (30) on valve base (42). Upper nut (30) is used to tighten the valve hole on inner rim flange (14). Applying vegetable-based lubricant to valve base (42). Tightening and fitting the lubricated tubeless tyre valve stem (40) on to the inner rim flange (14).
[0028] Referring now to figure 3A and 3B illustrates the application of lubricant on main rim, in accordance with one embodiment of the present subject matter. Applying vegetable based lubricant on main rim (50) and lubricant on tubeless tyre (62) before assembling the tubeless tyre (60) on to wheel rim.
[0029] Figure 4A & 4B illustrates an installation procedure of a tyre on wheel rim, o ring & lock ring in accordance with one embodiment of the present subject matter. Lubricating bead seat band (18) by vegetable based lubricant. Further, the tubeless tyre (60) installation procedure comprises mounting the lubricated bead seat band (18) on the tubeless tyre (60). Placing counterweight (66) on tubeless tyre (60) assembly for configuring O-ring (22) to the bead seat band (18). Mounting lock ring (20) on the outer rim flange to hold the tyre assembly.
[0030] Figure 5illustrates an inflation and deflation of tyre, in accordance with one embodiment of the present subject matter. After assembling the lubricated tubeless tyre (60) and wheel rim according to procedure described above the tubeless tyre is inflated by air supply (70) to a pressure 20% greater than the required pressure for some time and then deflating to the required tyre pressure for proper assembly of wheel rim and tubeless tyre (60).
[0031] Figure 6 illustrates flowchart for a method to ensure proper seating of tyre and wheel rim assembly. Inserting improved inner rim flange on to the main rim of wheel rim and tubeless tyre assembly. Mounting the improved inner rim flange and main rim on mounting support. Lubricating the valve base with vegetable based lubricant and tightening or fitting the valve stem to main rim by mechanical torque wrench. Applying vegetable based lubricant by sprayer on main rim and tubeless tyre beads and mounting tubeless tyre on rim. Mounting outer rim flange and lubricating bead seat band by vegetable oil through sprayer and then mounting bead seat band on tubeless tyre. Mounting O-ring on to the bead seat band assembly and gripping the outer rim flange by installing lock ring on it. Then suppling air to inflate tyre above 20% of required pressure for some time and then deflating to required pressure to ensure proper gripping of tubeless tyre to wheel rim. Inspecting tubeless tyre and wheel rim assembly for any air leakages by soap solution test to check air leakages.
[0032] Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include those provided by the following features.
[0033] Some object of the present invention reduces tyre rim failure.

[0034] REFERENCE NUMERALS:
Element Description Reference Numeral
Main rim 10
Inner rim flange 14
Outer flange 16
Bead seat Band 18
Lock ring 20
O-ring 22
Upper nut 30
Rubber seal ring 36
Tubeless Tyre valve 38
Tubeless Tyre valve stem 40
Valve base 42
Tyre valve fitment 46
Lubricant on main rim 50
Tubeless Tyre 60
Lubricant on tubeless tyre 62
Counter weight 66
Air supply to inflate tyre 70

,CLAIMS:
1. A method for assembling of wheel rim and tubeless tyre comprising the steps of –
• inserting improved inner rim flange on main rim;
• mounting improved inner rim flange and main rim on mounting support;
• lubricating the valve configured for inflation/deflation of tyre;
• tightening the valve base around hole of inner rim flange by the mechanical torque wrench;
• fitting the valve stem on main rim by the mechanical torque wrench;
• applying lubricating oil around the main rim before assembling by sprayer;
• applying lubricating oil around the tubeless tyre bead before assembling by sprayer;
• mounting the tyre on the wheel rim for assembling;
• installing improved outer rim flange to the tubeless tyre and wheel rim assembly;
• applying lubricating oil to the bead seat band by sprayer;
• installing of bead seat band around tubeless tyre;
• mounting the O ring on bead seat band;
• mounting lock ring for gripping of outer rim flange;
• inflating the tubeless tyre to a predetermined value above the required pressure and then reducing to required pressure for proper fitment of tyre bead on wheel rim assembly;
• inspecting the tubeless tyre and wheel rim assembly for air leakage by carrying out a soap solution air leak test.

2. A method for assembling of wheel rim and tubeless tyre as claimed in claim 1, wherein the lubricating oil is vegetable oil.
3. A method for assembling of wheel rim and tubeless tyre as claimed in claim 1, wherein the dimension of improved inner flange is in the range of 23mm to 28mm.

4. A method for assembling of wheel rim and tubeless tyre as claimed in claim 1, wherein the dimension of improved inner flange with optimal thickness is 25mm.

5. A method for assembling of wheel rim and tubeless tyre as claimed in claim 1, wherein the tyre is inflated 20% more than the desired pressure and then reduced to required pressure.